engine failsafe mode...
#1
engine failsafe mode...
hello all, first thread here...
did a search, didn't find anything relevant to my situation.
ok, so here is the deal. i have a 2006 expedition limited, with a tad over 53k miles. while i was driving at approximately 65mph the other night, i noticed the speedo needle was starting to drop, and then go back to the speed i was traveling. looked at all the other gauges, and everything was fine. engine temp was fine, battery was fine, oil pressure was fine. shortly after that (within a minute or so), the check engine light came on, the display said "engine failsafe mode", the "o/d off" light started flashing, and the speedo dropped to 0. the engine went into limp mode, so i pulled over to the side of the road to check things out. there was plenty of coolant, oil was full, transmission fluid was full.
so i started the motor again, and it was the same. "engine failsafe mode" showed on the display, the check engine light was on, the "o/d off" light was flashing, and the engine was in limp mode. i was about an hour from home, so i called a tow truck, and got the truck home.
so i borrowed an obd2 code scanner from a buddy, and got 2 codes. i got P0720, which appears to be an output shaft speed sensor issue, and P2106, which appears to be a throttle actuator control system issue.
with some more research, i came to the conclusion that the p0720 code (output shaft speed sensor) is an in-depth detail of the p2106 code. so i am thinking it is safe to assume that my issue is with the output shaft speed sensor...
i have read the sensor is on top of the transmission housing in the back, and to trace the wiring from the sensor to the pcm to chack for any shorts. i have also read to check the wiring under the steering column, behind the gearshift lever, for shorts.
is there anything else i need to check, or is my diagnosis off, or does anyone have any other advice for me on this situation?
thanks...
did a search, didn't find anything relevant to my situation.
ok, so here is the deal. i have a 2006 expedition limited, with a tad over 53k miles. while i was driving at approximately 65mph the other night, i noticed the speedo needle was starting to drop, and then go back to the speed i was traveling. looked at all the other gauges, and everything was fine. engine temp was fine, battery was fine, oil pressure was fine. shortly after that (within a minute or so), the check engine light came on, the display said "engine failsafe mode", the "o/d off" light started flashing, and the speedo dropped to 0. the engine went into limp mode, so i pulled over to the side of the road to check things out. there was plenty of coolant, oil was full, transmission fluid was full.
so i started the motor again, and it was the same. "engine failsafe mode" showed on the display, the check engine light was on, the "o/d off" light was flashing, and the engine was in limp mode. i was about an hour from home, so i called a tow truck, and got the truck home.
so i borrowed an obd2 code scanner from a buddy, and got 2 codes. i got P0720, which appears to be an output shaft speed sensor issue, and P2106, which appears to be a throttle actuator control system issue.
with some more research, i came to the conclusion that the p0720 code (output shaft speed sensor) is an in-depth detail of the p2106 code. so i am thinking it is safe to assume that my issue is with the output shaft speed sensor...
i have read the sensor is on top of the transmission housing in the back, and to trace the wiring from the sensor to the pcm to chack for any shorts. i have also read to check the wiring under the steering column, behind the gearshift lever, for shorts.
is there anything else i need to check, or is my diagnosis off, or does anyone have any other advice for me on this situation?
thanks...
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Djeap1977
1997-2006 Expedition & Navigator
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